None of you shall approach to any that is near of kin to him, to (c) uncover [their] nakedness: I [am] the LORD.
(c) That is, to lie with her, though it be under title of marriage.
Related Commentaries of Leviticus 18:6
Leviticus 18:6
6 None of you shall approach to any that is neara of kin to him, to uncover their nakedness: I am the LORD.